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          Institute: MPI für Kohlenforschung     Collection: Publikationen MPI für Kohlenforschung     Display Documents



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ID: 20096.0, MPI für Kohlenforschung / Publikationen MPI für Kohlenforschung
Influence of cosurfactants on the properties of mesostructured materials
Authors:Kleitz, F.; Blanchard, J.; Zibrowius, B.; Schüth, F.; Ågren, P.; Lindén, M.
Language:English
Date of Publication (YYYY-MM-DD):2002-06-11
Title of Journal:Langmuir
Journal Abbrev.:Langmuir
Volume:18
Issue / Number:12
Start Page:4963
End Page:4971
Review Status:Peer-review
Audience:Experts Only
Abstract / Description:The effects of the addition of two different types of cosurfactants, n-alkylamine and n-alkyl alcohol, on he phase behavior of silicate-surfactant mesophases and the pore size of the calcined materials have been investigated using X-ray diffraction, N-2-sorption, TG-MS, and solid state H-1 and C-13 NMR spectroscopy. The cosurfactants were added to a standard room-temperature synthesis, which results in a MCM-41 type, hexagonally ordered material in the absence of cosurfactant. Their addition led either to an increase or a decrease of the pore size and d spacing of the hexagonal mesophase, depending on the nature of the polar headgroup and on the chain length of the cosurfactant. For high cosurfactant/surfactant ratios, however, a transition to a lamellar phase was usually observed. The d spacing and the pore size of the hexagonal mesophase can be decreased considerably down to the supermicropore range by addition of butylamine without a marked decrease in the long- range order of the material. The addition of alcohol, on the other hand, resulted in an increase in the d spacing of the hexagonal phase by up to 3 Angstrom. These results are discussed in terms of differences in the ability of the cosurfactants to interact with the silicate as well as cosurfactant-induced changes in the packing parameter.
Comment of the Author/Creator:Date: 2002, JUN 11
External Publication Status:published
Document Type:Article
Communicated by:N. N.
Affiliations:MPI für Kohlenforschung
External Affiliations:Abo Akad Univ, Dept Chem Phys, FIN-20500 Turku, Finland
Identifiers:ISI:000176091900061 [ID No:1]
ISSN:0743-7463 [ID No:2]
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